A manager at an ice rink investigates the relationship between the rink's daily gas cost in pounds (ggg) and the average daily outdoor temperature in degrees Celsius (ttt) during February.
The equation of the regression line is g=12.8−0.6tg = 12.8 - 0.6tg=12.8−0.6t.
Describe the correlation between the ice rink's gas cost and the average daily outdoor temperature.
Give an interpretation of the gradient of this regression line.
Explain why this model might not be appropriate for the ice rink's gas cost in the summer.
8 exam-style questions on Edexcel AS Level Maths Correlation, covering 4.1 Correlation and 4.2 Linear Regression. Each one has a worked solution and a mark scheme showing where the marks go.